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Each peak in the mass spectrum corresponds to a certain fragment with a particular m/e value; The peak with the highest m/e value is the molecular ion (M +) peak which gives information about the molecular mass of the compound; The molecular ion is the entire molecule that has lost one electron when bombarded with a beam of electrons
The base peak is the tallest peak because it represents the commonest fragment ion to be formed - either because there are several ways in which it could be produced during fragmentation of the parent ion, or because it is a particularly stable ion.
29 sie 2023 · Look for the peak with the highest value for m/z, and that value is the relative formula mass of the compound. There are, however, complications which arise because of the possibility of different isotopes (either of carbon or of chlorine or bromine) in the molecular ion.
Explains how the molecular ion peak in a mass spectrum can be used to find the relative formula mass or the molecular formula of an organic compound
A peak on a spectra just means an ion with that mass to charge ratio hit the detector plate. The relative abundance just refers to how many ions with that mass to charge ratio hit the detector.
The first step is to identify the molecular ion peak. This gives the mass of the compound. The molecular ion peak will have the highest value. E.g. The mass of ethanedioic acid (C 2 O 4 H 2) is 90 gmol -1 and so the molecular ion peak will be at 90. High resolution mass spectrometry is so sensitive that it can be used to measure single atoms.
